Can someone please tell me what "milktoast" is?

Trump Slams Longtime Loyalist Kayleigh McEnany With A Weird New Nickname

Donald Trump turned on one of his most loyal White House insiders, slamming Fox News host Kayleigh McEnany as “milktoast” in a bizarre new rant on his Truth Social platform.
The former president was triggered by McEnany mentioning a poll that showed him ahead of Florida Gov. Ron DeSantis ― a rival for the 2024 Republican presidential nomination ― by 25 percentage points.

McEnany has a long and extensive history of supporting Trump’s lies and lying on his behalf, particularly when she served as his White House press secretary.
But Trump turned on her in flash, dismissing her as “milktoast,” causing the misspelling to trend on Twitter.

Can someone please tell me what milktoast is?
Can someone please tell me what "milktoast" is?
7 Opinion